Abstract and Logical Reasoning Flashcards

What is the missing number in the grid: Row 1: 2,4,6 | Row 2: 3,6,9 | Row 3: 4,8,___?

Answer: 12

Each row multiplies the first number by 1, 2, 3. Row 3: 4×3=12.

Five incidents occurred Mon–Fri: Mon=8, Tue=?, Wed=12, Thu=10, Fri=6. Mean=9. How many on Tuesday?

Answer: 9

Total = 9×5 = 45. Known = 8+12+10+6 = 36. Tuesday = 45−36 = 9.

Which statement is a logical deduction? Premise: 'All armed robberies are serious crimes. This offence is not a serious crime.'

Answer: This offence is not an armed robbery

If all armed robberies are serious crimes, then anything that is NOT a serious crime cannot be an armed robbery. This is the contrapositive.

Which is next: J, F, M, A, M, J, J, A, ___?

Answer: S

These are the first letters of the months: January, February, March, April, May, June, July, August, September.

Rank these distances in ascending order: 2.5 km, 2,300 m, 2.1 km, 2,050 m

Answer: 2.1 km, 2,050 m, 2,300 m, 2.5 km

Convert all to metres: 2,500m, 2,300m, 2,100m, 2,050m. Ascending: 2,100m(2.1km), 2,050m, 2,300m, 2,500m(2.5km). Wait — ascending means smallest first: 2,050m, 2,100m, 2,300m, 2,500m = 2,050m, 2.1km, 2,300m, 2.5km.

If no alibi witnesses are unreliable and all prosecution witnesses have alibis, what follows?

Answer: All prosecution witnesses are reliable

All prosecution witnesses have alibis. No alibi witnesses are unreliable. Therefore all prosecution witnesses (who all have alibis) are reliable.